I have been trying to decide on new tanks for my three male bettas, who are currently housed in 4 gallon heated and filtered tanks. My cousins and grandmas have their bettas in 1/2-1 gallon tanks and it made me think-who's betta is healthier?

One time, when I was younger I housed my past betta in a 1/2 gallon tank. I switched his tanks all the time, but he never had a heater or filter. He lived 6 years.

I haven't had that much luck with my bettas with heaters and filters. One had actually died when I introduced him to it, although that may not be the reason he died.

So this all made me start studying for this, and I need some of your betta(s) info:

How many gallons?
Age?
Where is s/he from?
Tankmates?
Heater or filter?
How often is the tank cleaned?
How much water is taken out?

Thank you, it will help a lot.
Please feel free to share your options or stories also.

How many gallons? = 5.5
Age? = I got him 6/6/2013, so, about a year old I'm estimating in total.
Where is s/he from? = Petsmart
Tankmates? = None
Heater or filter? = Yes and Yes.
How often is the tank cleaned? = I try to get around to it every week.
How much water is taken out? = About 50%

How many gallons? 5 gallons
Age? 9 months (squirt passed away from a defective heater)
Where is s/he from? local fish store
Tankmates? none
Heater or filter? both (cycled tank)
How often is the tank cleaned? once weekly
How much water is taken out? 30-50%

How many gallons? 10 gallons
Age? 1 month
Where is s/he from? local fish store
Tankmates? 5 dwarf mouth catfish
Heater or filter? both (cycled)
How often is the tank cleaned? once a week
How much water is taken out? 25-50%

i also had two other bettas in the 5 gallon befor lfs squirt. one was petco and the other was petsmart. both passed away within 1 week of having them

This for Snowbird (the girl in my avatar)
How many gallons?10
Age? Around a year old
Where is s/he from? another member (most likely AB)
Tankmates? snails and 1 loach
Heater or filter? both
How often is the tank cleaned? once a week
How much water is taken out? 25-50%

How many gallons? 10 gal NPT
Age? almost 4 years
Where is s/he from? small town LFS
Tankmates? corys, mystery snail, red cherry shrimp
Heater or filter? both
How often is the tank cleaned? every 2-3 weeks
How much water is taken out? 40-50%

How many gallons? 2X 5.5 gals (1 NPT, other fake plants + java fern)
Age? both 1 year
Where is s/he from? both from Petsmart
Tankmates? 1 has ADF other mystery snail
Heater or filter? both have both
How often is the tank cleaned? NPT = 2-3 weeks / other weekly
How much water is taken out? NPT = 30%-ish / other 50%

How many gallons? 2x 2.5 gal
Age? about 1 year (I went through a betta-hording stage!)
Where is s/he from? Petsmart
Tankmates? None
Heater or filter? heaters, no filters
How often is the tank cleaned? weekly
How much water is taken out? 50-75%

How many gallons? 2x 1.5 critter keepers
Age? about 1 year
Where is s/he from? Petsmart
Tankmates? None
Heater or filter? heaters, no filters
How often is the tank cleaned? weekly to 2x/week
How much water is taken out? rotate between 50% and 100%

How many gallons? 2
Age? guessing- probably close to a year
Where is he from? Petco
Tankmates? no
Heater or filter? heater and thermometer, but no filter (my boy does much better without)
How often is the tank cleaned? twice weekly
How much water is taken out? 100%, 50-100%

Name: Rembrandt a OHM Mustard GasHow Many Gallons: 3 gallons, Tetra CubeAge: 1 year and 4 monthsWhere is he from: PetSenseTankmates: 1 Peppermint Mystery Snail and two Oto's (Not permanent)Heater or filter: both plus thermometer to check heater.How often is the tank cleaned: Usually once a month because it is an NPT style tank (natural planted tank)How much water is taken out: 60-80% generally.

Occasionally I'll do a water change for that tank mid way through so every two weeks to help get rid of some hair algae so it doesn't kill my plants.

Name: Pip, DSPKHow Many Gallons: 2.5Age: 6 months oldWhere is he from: Aqua BidTankmates: noneHeater or filter: Heater, no filterHow often is the tank cleaned: once a weekHow much water is taken out: 80-85%

Name: Selkie, female HMHow Many Gallons: 1.5Age: 7 months oldWhere is she from: Aqua BidTankmates: noneHeater or filter: Just heaterHow often is the tank cleaned: twice a weekHow much water is taken out: one 50% and one 100%

Names: Kit-Kat, Hawkeye and Aero (divided)How Many Gallons: 10 gallon tank divided in three for each to get 3.3 gallonsAge: Kit-Kat is 5 months, Hawkeye is 8 months, Aero is a year.Where are they from: PetSmart, PetCo and PetSmart respectivelyTankmates: Four guppy fry temporarily on Kit-Kat's side and two oto's temporarily on Hawkeye's side.Heater or filter: BothHow often is the tank cleaned: once a weekHow much water is taken out: 50%

Name: Charlie the Giant PKHow Many Gallons: 5.5Age: around 5-7 monthsWhere is he from: PetCoTankmates: 1 Ramshorn snail and 1 Peppermint Mystery snailHeater or Filter: BothHow often is the tank cleaned: once a monthHow much water is taken out: 60-70%

How many gallons: 10
Age: Young, I got her from Petco and she was small
Where is she from?: Petco
Tankmates: None
Heater or filter?: Both
How often is the tank cleaned?: About once a week
How much water s taken out?: 20-30%